SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '451c0492d164a76a4d85759ac4e8bfcefd8d27c0e6678a8fa91db39f222f5d92' 
  AND token = 'YoEX0kzXMA5BDxzvvKBb9FT9/yvNkJsFtAkHgIUkD9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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