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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed3eef73966ee2236d8de91116c6d6bb916d529e90349e403fe6d9b61e01a4ee' 
  AND token = '/ZswTT7FX4lkC/0bxMLtz75xSGAg9r/lKm4AE3LIXk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}