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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'baf2dcffd513bab5722f33fbcb86f157b194b22d18bd0ee0cba7be21ea905c9a' 
  AND token = 'JT9ncJKw0eHmD7Y8c517tW0B0PFF0HD/dp+4wl3FbYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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