SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5050a3bf840b819d1bf925c549b89504f39f1fa1f1ade499a444bfe78bf322fc' 
  AND token = 'BFjJX4f7hHoCZpV/ZLIDTfZEPLa1N+48m0QKKHDg7Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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