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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62e2382b8c07e41e5958c84a8e511d9ab3f5448bd6a9a34309e59273e7354709' 
  AND token = 'h3p+rHhrM4InGae9rewK2R9Iclc3PRVEH0pdwe52sAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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