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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ad8592f7c3215698ddabf96725c49d91750bcae5e8788282a59aa9a031d676d' 
  AND token = '2tVddHrU47D9w8f07OlVTFNqVUhNQkK1XLU94R+uX10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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