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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea02c673c3bb71bb13690df93ec27a867c85a82f67d10d6001c60008f59a2b72' 
  AND token = 'POuO093wgeSPdE/BI6ZdcxvO78smF9ZOeQ1n7jLKvi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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