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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c224be3906f1e92b0c84fa70ddee651e58197b4f18bfc9bb15e8b2c70fe64d6e' 
  AND token = '6WMhcn6F1CLZF/7WWNi5wCIiIsKX1G8+DWs/kIs3S7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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