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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70de55ee0c93ff3f5b56f68cbe86563ab9cfa4c3935f53fb35024928d6cbf7ed' 
  AND token = 'pbvsfm4Rd8AXmJeLhdRy0HsmYMHf3GlB9EI5wOcPL64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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