Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f50e6a35489f9ec31cff0ab48358e8c4beae093c45ba7bcb778e8f475ba1efd' 
  AND token = '+whsdCCpCSzXHb4OxxCmCLu6sAuTwOs/pb7hODfNhwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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