SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bcf9a185f06ffe4c129b4b4f3c62834bfa9230ffd5e7d6d646041f1f45df377' 
  AND token = 'LavjRA+2WYcjsf+NHEjV8rNwiVtkUTqGc9AQ+t/9ZDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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