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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad686cb167ba311509c12f34a1eabe904046865397407e9a134005881e116bdb' 
  AND token = 'Yg7F0MaV7ghx6EPPSM9jAikeIJzQPExBMLKCAZdD9JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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