Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40cdc83770d767c50d7de7ddc7120f1d5292c3d0a1a8bf6b7631340782133aec' 
  AND token = '6yWnWxZ8v+GG8HzZUw62XWLzIaBCvlfvg219SiGWz6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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