SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7da361b739ce9d6281cbf25207e99f9c3d1e84f34a5e26686f5de31f15022841' 
  AND token = 'LgtqRyz5aikvXqmE5LPZu2IIv0i90y67/LvNXzdUB+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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