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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd0995073e37e1700ee33fbb5e2918af459e0dac8db156c9782719a340c75135' 
  AND token = 'bQ6xkNa1NorneSGg7da3PPJrMye3pq5KG5fEcWat6qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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