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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ce1726d16185371915fc95381a29c2311f572c2759103b2d149aa76316a311d' 
  AND token = '8OY4J4Yn08d/p8RiX3aW7V+7oD9dhjeob6aiaLnu7tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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