SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca1e38777fdf77f5f609c0bee80f8f77ee08ab415b8640b9c45d868db2f4fd27' 
  AND token = 'b3yl9HYY0gKgR3qwDFvt1zB8YKy+uNUMQIXxXA3x+Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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