SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '082fb9c59eed3da53414677673eabe58a3ece3f84d0eaeb5b0011014fd62707f' 
  AND token = 'wpbUVWpV+F4X8ex0NnJrQhFnPDYAndMu19qJhjv+CHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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