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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d39db84ba78ca4b724322e4a44a8d21ceb5e788a3bb4f11c803bc86b53d2ab2' 
  AND token = 'Y+Dzo27xF2ZPhpskK6uww2ndhyxe/bTQKWG1yYXU+L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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