SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9202a08d4087ea72786647294f9868c5d9a40156160d70483c74e23d25451e65' 
  AND token = 'Fx14KYmAMvTTmdUFVwbYh1IQeFyqYJiu6n14vjxX+1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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