SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62071e09984db0e1d9c2aded273f38a261ac1c221385dbdd76f1e6912980db47' 
  AND token = 'BVzG1JheqofZxWbBQzAqiZlC2UKZQmuInzREHUbMCMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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