SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be6a5de320fb1dd3cea1785e0e740eaf4a9eec68f64515918e54127687c64b01' 
  AND token = 'wzVLQJfphQGNCXTYXsatjugcQExfc+J9XRGiJDxNQy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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