SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b4983a943b86f17586a69939fca176a8c4a9ee79d5258a6821bcdfd2f439f3d' 
  AND token = 'nXu+pMJoFgZz3wd4opN8+U/CVVKhxcbPEiwGUV2dc9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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