SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e33622634ec401e45ed36f0b52ec48f2efe150b71491b95874bd1988f5c53e6d' 
  AND token = 'PtKENuQeIskqDJWiYy7WGgp8kF2rLXvfLBqXIluaUiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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