SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7c608bcb3db3be412ae42e25e23f5485bd389696092f6b043468cf5f41056b4' 
  AND token = 'tE5GmdmXSoof9ZV8tQMMhKJsuPx1cO4/xKDazzozhKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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