SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90af56b18b32e43b121f4c1d616838c6f852aeb3ea969039cef844d2a50ccddc' 
  AND token = 'MbIrMBNYw7Mq/XBd26viofIoFV7JzO6ASt3jSFNr+AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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