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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75037b046e30f566a3b3c2ee4b221dd8f6785239030d498a915af4314d938960' 
  AND token = 'peYfwsCKMsQIhJb48LAeXR4OEYRHI/6Z0h72MdhHkrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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