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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfde1ad493c2ee264879faa47eed7c3063740651ef30bfdd7128c040cd0c9d4f' 
  AND token = 'ZCMyb+T1IMXHHRPHBjDNL1HKj2UNNddb1/9v9FWOfXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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