SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1857085962f9fae310226c3b5f58b457bcb230728926e9032e08e076dd5cbedb' 
  AND token = 'PaY9VrI2hHpCzAO7IJSIzGG/h6HB4uvWSqeIccrVhRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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