SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cff44251c66848e3d8a20026c8e3eec3bd8842e3d406058a674a737bcf66744d' 
  AND token = 'M9mn4s/DgO61pZJ8zYloL1eFgZbG2Nhimv+sJQ+aJ2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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