SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d295d48dd5119ecc0a2e1b44a66e9c23f040ac29c05890c92dff7bbf8fdad07' 
  AND token = 'iHGPpjY2395OLm4Zp5YDncYQhv/UOE2Y+7xCGGU/I08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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