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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26f1c264f6bdf49c667cb6d951b7e3c7e192bd547971110a986e1e1b53c5d4a5' 
  AND token = 'gsmpo30ijoyo4aeYFe7FpZ1qGAzWmSFTxWENSVxBSoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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