Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51f887b28d60bc068a5f749690cae8559b77c76d734b951dee475faf59491033' 
  AND token = 'kpk6NBM78zwc6IP65XKbJ+RV7KHAb4Q0yIMPlKNNBKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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