Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddb7b1dffa4bf590aba01771dc226ebcf1e5c521443e54cdb9a95b9ad3bc0ea4' 
  AND token = 'FUjF62XgW8CVElEPDMd4kM+RJ6sIDhOxRIJcoN8UevQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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