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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ed65ccdb58306bd08e0fcd7b1e292a9f4a207a185e0676b454c4263ff8829df' 
  AND token = 'qGCsNoaw0Dc87c7dVNhPPfKKT0tsKHa/8EiGN63cjPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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