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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34079602c61d1c3d44d07258591a28f1d6fe2cd3d13ee85e0f432fe2447d802f' 
  AND token = 'VC2d1TS6mRYe0gEK4YK7dYVpddt4Dy6ELZ1hd7ZeoFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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