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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43614369efd0908b431c371b0adbea40afcb337248b5bf101e79df1177ccb4a3' 
  AND token = '+zmJdjDyNcfafXAwF8TKtqzd9w9A2YgK0UYRSNSBOWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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