SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03329ecd3051b80c83872853c014cea0e9c42d0253d2392844994393dbc76fae' 
  AND token = 'zh05iBZdOFeGB+95ScgpXh+h0YWzwNBLJQ/BIl32PGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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