Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d0c19cd357cf3f7a1a03df660accaff1dd7d8a68f4f8a60e2b7cdd4c213cefc' 
  AND token = '4AIYnG09nEaIxg+XQ/7OoovRWErWPg4Wc81rlgmTzkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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