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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67781d6cef2173c2db27437869b6bf5338048dd7e9aa11c1699272d57c3aa998' 
  AND token = 'TDUmjgl+NckdClOWw7jYKCYIwj51RxyHyoP5PJsk3SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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