SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '534c026902fc251900d441d6286aa2c68fab657bcbb0f02890516744e2da03ed' 
  AND token = 'rKkGyRa5CzwGUcIJybhUsA9UVg3uJTK9KsDAVvoBhxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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