SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a3471e6c5d738e3229b766cf137178eae22d9e050c2cd18cb3528b20ba6eea2' 
  AND token = 'EI8+lg/gVKDcoEHXTYA6wUGmY6MtCzBtq1LkOyEOSgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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