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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '823aedb63032a231c41d08caf7f80a3f2773caa76c8eeb23257c67bc5bc73935' 
  AND token = 'GA+xFF4/sCp6G/EkXHEhMeEEW9Zse6lOb7LzYsmbFQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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