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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de9078bcaed317c679befb73a63b5a0f18365347d4f89acd4b17ee644c058ccf' 
  AND token = 'jpmkTqqlsj+ynUxmA70sdrer0a/f6dJnc5e7CeWUD5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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