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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f302c34d9e5ef47b0df3f30107aa0d8af27b8436fa16e0630946e7443ff748c8' 
  AND token = 'htWjur5bAcOpFcruUWd4dpwj4GHP60cmXlMOM7Sdo34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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