SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4065a4de73c2ff47494327ec7e1d5eddbb66a8f3879acf414b9d8325041ee49b' 
  AND token = 'UY6LmgIJh+Q+Hx/red3RHBADixv6UxNQPdJHGzymrQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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