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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f459e89b4637deece254244cc1141254812d0faf6076867cc5e0c0eb4047c21' 
  AND token = '8f7X1t1fXk3n/UiozEvndxshChLvKYsQDm0q/zL2QRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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