SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5180569328ac01768a0cfd860c7e4e257006a339c1fc480ea34a5a65bbbceb4' 
  AND token = 'PDTzOf8+B9lCUEEZY3vTUyx8qwVFgH2gqRdGoY1z2ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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