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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8ca4f8a5c7cba6ada6678345855b4b665daf15dfd7c5ff95de23d2ef8a2317a' 
  AND token = 'zCU23MosIew7qojap++LRvB99Rq9ptrT8A6C94yacYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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