Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a878c9a7c1003dca6b569ca0d1a05af0a0891a4f6d64132724ac62c3632042e' 
  AND token = 'C6288iq1K4RjP+MH4PVNUR110UOYMC8ilcByffJt6OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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