SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bb0094a2d77f58618a9f8822b17200b20c418ffe14339c2fbc5922826f3402e' 
  AND token = 'BTzjF6bG7yNu3G+D2gnvHT1C02GnjCotLWmJvMSk0KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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