Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '412a1f1df616ce5ef29ec74dce54bc8d184d8c4d012d6ff42155879c4f7bfc1e' 
  AND token = '+17yudkDIjDTv0sl6Z+PbL9TPYGsaMx4FX/J/QGJMWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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