SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0b98442368917e30df0b363af39d51068478e74ea6f20b685a077a386149fe1' 
  AND token = '145/GwE7jJ/gB+Xd/0HivKYfIOoaY65HbEX2DGlIfxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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