SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d6e6da4386006a347e349bfaf94764e66253b07d88b4193393ba706466f625f' 
  AND token = '05iBxupMXGQVRZ9/zqUpjtH7KilPcEb+YDQMxmHSwcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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