SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '301dc96f90684f916d7045153e53a7632872d2e6928cb47284cdba3a6ac3d5bf' 
  AND token = 'rvvv0IfUCAkA6Z5KAL9xAoYHgZko2CuVKWGw/wuDFeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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