SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c13b2231b338ea63379bb4064125cf67f870415a970c1eaf28686b59b3e1ae6' 
  AND token = 'zw0i35Hu6dzOE1fGUm5qkdbwXpv8hnzWQ+YZ6JSlO0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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