SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e876abec3de0dd5e7cd347d2ece314a0230f650a90320fd4779389d2a1c21b4' 
  AND token = 'ztergTdYWKcqZx6CoYaxzX+BNpnJOh4PIHyhGU8Ha6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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