SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cb6389e9f2010d7a95fdb42a3d9a84802b6286e5ecbcc1d1229669ead2e74b9' 
  AND token = 'E+V/TH9iuFeHsrhYHiwWZy34iVjDNBwyBLuj2E0qQEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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