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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91d563bc92d86df250f1be1030302dce5a8c8d2138ef8806bc61cb480844dc21' 
  AND token = 'MjSpuWAMi6k/i8CMkWtebsGDd7EbZyDPHZdvl6JZTsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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