SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4754911c4071a4b0a17527ede959a83473a97593473460b3c87f6986aa9dbfb0' 
  AND token = 'jRpISjDimpKF0MnJRYZxtPXEIfDqLGGXNi7YJmc/pfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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