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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6128a88b3cab9cf89537a6eb7865f8e09bd41504c187fad31968d1f82ff6bc2' 
  AND token = 'miaXLwxTuYfWtTVe4FOUZjvtfksE1QHQspdSWI7QW/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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