SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2074aa3a79f2c495b5eab930799f351da51b42889a95290926b6e5a2a6c42ff1' 
  AND token = 'qhZojXqevVIh79PGhDSSUUwStx8iL4gbdp83QzAGRNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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